Retrieves the latest status of the last upgrade or upgrade eligibility check that was performed on the domain.
elasticsearchservice_get_upgrade_status(DomainName)
[required]
A list with the following syntax:
list( UpgradeStep = "PRE_UPGRADE_CHECK"|"SNAPSHOT"|"UPGRADE", StepStatus = "IN_PROGRESS"|"SUCCEEDED"|"SUCCEEDED_WITH_ISSUES"|"FAILED", UpgradeName = "string" )
svc$get_upgrade_status( DomainName = "string" )